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Inter-response time (IRT) distributions in log-spaced bins as a function of sessions of training for differential reinforcement of low rate (DRL) criteria of 15 or 30 s. The early distributions were from sessions 1–2 of training, and the late distributions, from sessions 9–10. The vertical dashed lines denote the IRT criterion in effect for the DRL schedules. Adapted from Pizzo, Kirkpatrick, and Blundell (2009).
